14 25CI400A/W • 25HI400A • 50CI400A/W • 50HI400A
Service
Ice machine operation
Follett’s ice machine consists of four distinct functional systems:
• Refrigeration system
• Water system
• Harvesting system
• Electrical control system
These four systems work together to accomplish the production and harvesting of ice. A problem in any one of these
systems will result in improper operation of the entire ice production cycle. When troubleshooting the ice machine, it is
important to analyze the entire system operation to determine which system is not functioning properly, then pinpoint
the component within that system that is malfunctioning. Determine what corrective action must be taken before
making any adjustments or replacing any components.
The icemaking process
The Follett ice machine uses a stainless steel jacketed evaporator and operates on a continuous freezing cycle.
Water is supplied to the evaporator from the water reservoir where the water level is controlled by a oat valve. This
valve also shuts off the water supply when the ice machine is not running.
When the ice machine is running, a layer of ice forms
on the interior surface of the evaporator. This ice is
continuously removed by a slowly rotating (12 RPM)
auger.
The auger carries the ice upward into the cavity formed
by the top bearing housing and the compression loop,
where it is compressed to remove excess water.
When the ice reaches the desired hardness it rotates
within the cavity and is forced through a discharge
port and compression nozzle and into the ice transport
tube. The discharge tube and compression nozzle
are slightly restricted to further compress the ice
and produce the desired hardness. As the formation
of ice continues, ice in the transport tube is pushed
through the tube to the storage compartment in the ice
dispenser.
A solid state control board, located in the electrical box
of the ice machine, controls the normal operation of
the ice machine and monitors gearmotor torque. This
control board will shut down the ice machine should
an over-torque condition occur. It is very important that
you familiarize yourself with the operational sequences
detailed in this manual before attempting to service the
ice machine.
Ice harvest system diagram
auger
compression nozzle
ice transport tube
discharge
port
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